Car dumping apparatus



July 24, 1934- R. w. KALTENBACH CAR DUMPING APPARATUS Filed NOV. 29, 1929 S'SheetS-Sheet l July 24, 1934 R, w. KALTENBACH 1,967,246

CAR DUMPING APPARATUS Filed NOV. 29, 1929 8SheetS-Shee 2 @Zug 7620/@ @QV/Tiro( MVM I 54 @M7/ft July 24, 1934. R. w. KALTENBACH CAR DUMPING APPARATUS 8 Sheets-Sheet 3 Filed Nov. 29, 1929 75 www/MMM? July 24, 1934. R w, KALTENBACH 1,967,246

GAR DUMPING APEARATUS Filed Nov. 29, 1929 8 Sheets-SheefI 4 July 24, 1934 R. w. KALTENBACH CAR DUMPING APPARATUS Fied Nov. 29. 1929 8 Sheets-Sheet 5 July 24, 1934. R. w. KALTENBACH GAR DUMPING APPARATUS 8 Sheets-Sheet 6 Filed Nov. 29, 1929' n i V Fm. f-f z 0 FIG- #d Y gwn/vendor, @da

July Z4, 1934. R. w. KALTENBACH I 1,967,246

CAR DUMPING APPARATUS Filed Nov. 29, 1929 8 Sheets-Sheet 7 July 24, 1934. R. w. KALTENBACH 1,967,246

CAR DUMPING APPARATUS Filed Nov. 29, 1929 a sheets-smet a Www wg mbz/LMI Patented July 24, 1934 UNITED .STATES PATENT OFFICE 16 Claims.

l l `converged toward `the outlet so as to direct the contents into the hold of a vessel. These chutes .are shallow pans, but are objectionable, as they do not readily permit the momentary interruption ofthe ilow of contents into the vessel, after the coal enters thepan` It is desirable however,

to provide an apparatus by means of which a car maybe inverted and then replaced in the cradle `by another car, without requiring the first car vto be inverted slowly until the entire contents c' 420 are deposited in the pan.- In other words, itis desirable to run acar into the cradle, invert the cradle as quickly as possible, return it to the normal position, and then remove the` car independently ofthe amount of coal which may be in the .11.25 chute. VIt is also desirable `to provide apparatus for maintaining a continuous flow of material Vwhile directing it into the various parts ofa vesseland to avoid the necessity for manual trimming ofthe load. By maintaining a continuous discharge of `material breakage of the material,

particularly coal, is minimized. An object of the present invention, therefore, is to provide a car dumper which will permit a barge or vessel to be quickly and `continuously loaded, and which will provide for flexible control vof the position of the outlet at the 4point of discharge `so as to direct the material wherever desired within the vessel. A further object is to `provide an apparatus by means-of which the ow into the vessel may be selectively controlled for permitting continuous or intermittent loading, notwithstanding the fact that the car inverting operation is an intermittent operation.

`Icarry out the above objects by providing a hopper into which thecontents of the car is discharged, The contents of the hopper is dis- Vchargelronto an endless belt which` is disposed within a boom that extends laterally from theY hopper. Near the end of the boom, I provide a `discharge chute into which the material flows, as it falls oli the end of the conveyorbelt. Provision is made for manipulating .the boom-,with reference to the hopper, and. for manipulating the dischargechute with reference to the boom,

`= so. asto place the discharge outlet in any desired position. With this arrangement, the ow at the discharge outlet may be controlled merely by controlling the speed of the belt, and if desired, the lcw may be continuous, notwithstanding the fact that there is an intermittent filling of the hopper.

Further` objects ofA my invention, include renements of construction of the operating mechanism so as to facilitate the movement of the various parts, particularly the clamping mechanism, the boom operating mechanism, and the discharge chute control mechanism.

Referring now Vto the drawings, Fig. 1 is an elevation of a car dumper embodying my invention; Fig. 2 is an end elevation of the cradle; Fig. 3 is a similar elevation showing the arrangement of apparatus for operating the clamp; Fig. 4 is an end View showing the means for holding the platen in the normal position; Fig. 5 is an end elevation showing a different position of the mechanism illustrated in Fig. 4; Fig. 6 is a section taken on a plane indicated by the line 6-6 in Fig. 4; Fig. '7 is an elevation on an enlarged scale showing the manner` of supporting the lower end of the boom; Fig.4 8 is a vertical section taken longitudinally through the lower end of thehopperend boom; Fig. 9 is an elevation taken on the line 9 9 in Fig. 8; Fig. 1,0 is a vertical section taken on an enlarged scale through the end of the discharge chute and Fig. 11 is a section taken on the line 11--11 in Fig. 10; Fig. 12 is a sectional detailof the portion of the discharge chute; Fig. 13 is an end elevation on an enlarged scale of the cradle and its driving mechanism; Fig. 14 is a plan of the driving mechanism for the cradle; Fig. 15 is an enlarged detail of the discharge chute, some of the parts being shown in section; Fig. 16 is a section taken on a plane indicated by the lines `16--16 in Fig. 15 and Fig. 17 is a fragmentary perspective showing the manner of supporting the lower end of the discharge chute.

I have illustrated my car dumper as positioned upon a pier 10, and as arranged to load a barge or vessel 11, which is positioned alongside the pier. A supporting frame is shown :as being mounted upon the pier, and as comprising a `fabricated structure of conventional design. The frame is indicated in general at 12, and is shown vas supporting a cradle 13, a hopper 14, and a boom l5. The boom is a hollow box-like member .which carries a conveyorbelt 16, and which is used for conveying the material from the hopper and outwardly to the end ofthe boom. A chute 17 receives the material as it passes from the belt and conducts it downwardly and then discharges it at the desired location. Approach and run-off tracks lead upwardly from the pier to the cradle and align with the cradle tracks 20. The cradle, as I have shown, is of a form usually employed for a rotary car dumper wherein the axis of the cradle remains in the same position during the dumping operation. To this end, the cradle is illustrated as being supporting on wheels 25, which 'are journalled in brackets 26 ronropposite sides of lthe center of the cradle. The brackets in turn are pivotally mounted as at 27 on the frame. The cradle carries a platen 28 on which the tracks 20 are mounted, and mechanism is then provided for moving the platen laterally and into engagement with the customary buffer blocks. `Mecha nism is also provided for clamping :the car fonto the cradle during the rotating operation.

The rotation of the platen is accomplished fby means of a suitable motor 160, secured by the frame 12 to the car dumper. This motor, through suitable .gearing -161 -drivesa'line shaft 162, jour.- naled inbearings 163 secured to the frame. This line shaft is-fjoined ateither end with a shaft 166 by meanszof suitableflexible couplings165, one-of -which isshownin iFig. 13. The shafts 166 are in turn joined to shafts 167 by means of -suitable Aflexible couplings '1168. vilach shaft 167 -is I'carried -in ia 'suitable 'bearing member l72.secured to the frame, `as hereinafter described. The shaft 167 carries a :spur gear r169 which .meshes with a gear T70 `carried by a :countershaft 171 journaled in the bearing member 172. Thecounter shaft 1171 ,also'carries a pinion `I174 which fin turn meshes with .thesegmen'tal :ring .gear 185 rigidly secured to the .rotating carriage .or Vcradle 13. It will be 4seen 'from ithe following -that the motor 160 will .serve to 'rotate the cradle. As the cradle is of considerable flength, it is ffound necessary to pro- -vide means -of adjustment for the pinion 174 so that =it may :readily mesh with the segment 160 .underall .operating conditions. This is preferably :accomplished by .mounting the bearing member 'i1721u`pon the fra-me in sucha lmanner vthatit may '.befshifted. As shown, the 'bearing 172 is'secured .to the .frame by :means of boltsV 175 -which .pass through slotted openings 176 inithefbearing member and :a -suitable :adjusting screw '178 iis 4rigidly :secured to Vtheibearinglmember and passes -loosely 'zthrough a lug member 186 secured .to the frame 1'2, to v.the :end :that the beta-ring :may :be thrust forward, moving 'the .pinion v1.7 4 intomeshing position with :the gear member 1'85. When the gears .are insmeshing position, Athe :adjusting screw 178 4is locked by means of :a lsuitable lock Anut 181.

The weight of the cradle and a part of the load liscounteracted by weights Si), iwh'ich are arranged in .-a row alongside :the frame, and which are connected .by :cables 31 to .the cradle. There are preferably :four sets of .counterweights and cablespand 'in eaoh case, one end 32 of the' cable as shown in Fig. 3, extends downwardly vthrough the :clamping member 3B, and thence behind clamp :34, 4and is .then .anchored to the cradle .las :at 35. From the clamping lmember the ycable passes :around sheaves Vlocated at `the top of the frame, and .thence downwardly around-a -pulley :36, which is .attached to the counterweight, and .thence zupwardly lover 4guide sheaves at the top :of sthe frame, ,and then downwardly and around guideways 37 :and .38 on the cradle vand is then .anchored to the cradle `around a pin 40. Thus it is .apparent that .the `counterweights and cables yfunction not only toV counterbalance .the weight 'of the cradle, :butalso to clamp the car tothe rails during the .dumping operation.

:end anchored thereto at 48, and the other end attached to the clamp at 49. The shaft 46 is journalled in the cradle on the side of the wall -41opposite the'clamp, and an opening is provided in the wall through which the cable 47 and part Vo-the sheave may extend. In the position shown in Fig. 3, .the sheave 45 is holding the clamp out of Contact with the car 50.

v `Tofoperate the fsheave 45,1Ihave shown a vdrum :'51, 4which is Vlralsol Vrigidly mounted on the shaft 46and which'has one end of a cable '52 anchored 'thereto at V53. The other fend of the cable is-connected at .54 tofabell crank ylever 55. Such -lever is shown as lbeing piVotally-mounted-on the=cradle vat-40fan'd as yhaving@the'other end thereof pivotallyconnected at 56'to -a link 57, which in turn is pivotally-connected at 58 to 'a'lever 59. -One'end of the lever in vturnis pivotally mounted at y'60 on I thecradle, and is provided at the other jend Awith :aroller 61, which is-adaptedito engage'an abut- 'ment .at 62 on the vframe. tlfiissystem oflevers and-cablesis suchfthatin the position shown -in Fig. 3, the roller 61 `vbears A' The arrangement lof against fthe abutment and acts vupon the shaft 46 "to `-wind up the cable 47 yon the Vsheave 45, and thereby to hold the clamp out of contact with the car, as the cradle thenstarts vto turn in the vdirection indicated -by the arrow in Fig. 3, the l roller `61 tends 'to leave -the abutment, and 'the 4clamp tends vto -descend lunder the action lof gravity.

The inclination of )the abutment 62 with referenceto the vertical isadjusted -to permit a uni- Iformdownward motion of the clamp during the initial-return movement of the cradle. On the vreturn movement, the roller strikes the Aabutment ybefore the cradle is in the normal position, ywhereupon-continued rotation with the cradle toward the normal position causes a downward `pull on -the cable 52, andfa corresponding upward pull on the cable 47. This results in an upward movement of the clamp.

Normally `the platen -is-in the position indicated in Figs. '1, 2 yand 3 wherein the side vof lthe car `-is out of contact with the buffers 65, which are carried on the cradle wall 41. To hold the platen in -such position, I provide a roller 70 vwhich is journalled in a bracket 71 at each end of the platen (see Figs. 4v and 5). The rollers in turn are adapted to engage an abutment 72 which is carried by the superstructure 73 for the appreach-and runoff tracks respectively. When the cradle `is in the normal position, the rollers come I.. "into contact with the abutment and springs 74 are compressed. There area plurality of such springs -fand each is shown as surrounding a lbar 75, one

end of which is afxed to the platen and the other end of which is slidably Amounted through an 'opening ina wall 76 of the cradle. cradle is rotated to empty the contents of a car, the rollers 70 tend to'leave the abutments 72, thus Thus, as the permitting the springs 74 to expand, and aided by gravity they carry the pla-ten laterally until the car engages the buffer blocks. Conversely, during the return movement, the rollers engage the abutments before the cradle reaches the normal position, and the parts are so arranged that such engagement is effected after the rollersl are acted upon by the abutments 62 to release the clamp. Continued return movement then serves to compress the springs 74.

The hopper 14 has the upper end thereof suincient in size to accommodate the longest car,

`Whichis capable of being handled on the cradle.

.The walls of the hopper then converge downwardly until `the discharge outlet 89 is sufficiently restricted to enter the passage 81 in the boom. As shown in Fig. 8, the bottom wall of the hopper terminates at 82, at a point forward of the lower reach.83 ofthe layer belt. A gate is associated with the discharge end ofthe hopper for restricting the effective area and thereby for controlling the flow of material from the hopper and onto The'hopper control gate preferably comprise a U-shaped member, the arms of which are indicated at 84 as being pivotally mounted on the shaft' 85 and the intermediate portion 86 of which comprises a curved memberiwhich extends across `the opening 80. `The curvature of the intermedi- `ate portion maintains a close fit with the end of the hopper,`while the gate is .being moved. To operate theV gate, I havel shown each arm84 as having an ear 87,`which is pivotally connected to a pitman 88, which in turn isconnected to a crank arm 91. Such crank arms are thenoperatively connected through gearing 89 to `an electric motor 90, 'which is shown as being mounted on the hopper. Thus, when `the motoris operated, the gate is swung about the axis of the shaft with the result that the ow of .material from the hopper is either restricted or enlarged. The use of 'cranks and pitmans for operating the gate' is .desirablaas the gate .is automatically locked in `either extreme position by the dead center position of the crank. In Fig. 6, the gate is shown in full lines, as being in the position to restrict most effectively the flow of material from the hopper.

To support the boom and to permit maximum range of movement, I provide. a saddle which is carried by the frame and in which the lowerA end of the boom is adjustably mounted. The outer end of theboom is'supported by a cable which `leads downwardly from the top of the frame.

Referring `now to this construction more in detail, and particularly to Figs. 7 and 9, the ends of.` the shaft 85 are shown as being journalled in Abrackets 95,` which `are disposed on ODDQSite-sides shaft carries rollers 102, which are adapted-to engage trackways103at thebottom of the boom.

Directly abovesuchtrackways 1are other tracks 104 which are positioned on`the top surfaceof the boom,'and .which are `adapted to be engaged by `rollers `105 on the"` shaft `85. This supportingconstruction thus causes theboom to Vbe'pivoted about the shaft 85. i

` To move the boomQ'about the pivot shaft 85,71 `have shownin Fig. 1 a single'cable 110,"the ends of whichare attachedto drums 111 and the intermediate portions ofwhich are reaved between sheave blocks `1`12,"which are positioned on" opposite sides of the boom, and sheaves113 and 114 to Vcharge outlet.

and 119 toan electric motor` 120.

the upper part of the frame. While I show only one drum, in reality, I employ two drums respectively in axial alignment and arranged to be oper- :ated simultaneously, so that when the'cables' arev wound in, the boom is raised and as they are paid out, the boom is lowered. Various illustrative positions which may be obtained by the boom are indicated by the broken lines 15a, 15b and 15e in Fig. 1. v

In addition to the pivotal movement, the boom `can be racked longitudinally, thus adding materially to the flexibility of control without substantially altering the vertical position of the dis- The mechanism, which I have shown for effecting such longitudinalmovement is best shown in Figs. 1 and 7 and comprises threaded shafts 115, which are rotatably mounted on each side of the boom adjacent the lower end thereof, and which are adapted to extend through a correspondingly threaded passageway 116 in the a frame 94. The outer end of each shaft is suitably journalled in a floating bearing 117, while the lower end is connected as by gearing 118 This suspension of the screw shafts places them under tension. The motor `120 is shown as being mounted upon the boom adjacent the lower end thereof. Automatic control devices are indicated in general at 121 for shutting off the motor in the event that the operator should fail to stop rial, as it passes off the 4belt 16, and is deflected downwardlyby a guard 127.y The lower end of the sleeve enters and is pivotally connected at 128 tothe upper end of the tubular chute member129. The pivot 128 extends at right angles to that indicated at 126 as shown in Figs. 14and 15, thus providing a universal movement for `the chute with reference to the boom;

The chute, as illustrated, comprises a plurality of telescopic tubular members, the lower and .outer one of which is indicated at 130 and is arranged to support sheaves 131, throughwhich cables 132 are adapted to extend. Such cables are arranged to be operated by electric motors, indicated in general at 133 at the upper end of the boom. The control arrangementis such that, the

.groupsjofcables on opposite sidesof the chute can beY operated simultaneouslyrso as to swing the lower end of the chute abouteither of the desired. j v Adjacent the lower end of the member 130, I

,provide "an apparatus fordirecting the now of `material horizontally from the chute. Such ap.;

Ypivots 126 or 128. In addition, allfof the cables u can be operated simultaneously to permit thel telescopic tubes to extend, or to retract them as paratus is best shown in Figs. `1, 10 and 14, and

44coinprisesa hollow casing v140, which is `rotatably Vjoui-nailed at 141 to the lower endY of the member 130 and whichv carries a gear 142 whichis `adapted to meshv withapinion 143 (see Figs. -1`0 and 12).` AnI electric motor 144 on the member is rotated with reference to the chute. The flow of material from the casing is governed by the -position of a gate 145, which comprises a curved plate pivotally mounted at 146 within the casing. A pin 147 is removably positioned across the casing and is adapted to hold the plate in the desired position.

The defle'ctor plate in Fig. 10 is in position to direct the flow of material through the passageway 143 and directly into the barge or vessel. When the gate is in the position shown inthe broken lines 145e, the material is directed onto a trimmer, which comprises a conveyor belt 150 and which is mounted within the casing. This rbelt is arranged to be driven at a relatively high rate of speed by an electric motor 151. When so operated, the material is forcibly ejected from the casing through the passageway 152 and at a considerable distance from the opening. Thus a vessel may be trimmed during the loading operation, thus obviating the necessity for manual trimming of the load.

It is apparent, from the foregoing description that I have provi ed a car dumper,` by means of which material may be discharged continuously into a vessel` or barge, while it is being fed intermittently into the hopper. Thus, by making the hopper of sufficient size and by operating the belt at a predetermined speed, the continuous discharge into the vessel can be maintained while allowing ample time for a car to be inverted in the cradle and then replaced by another car. It is also apparent that during the loading operation, therate of ow may be selectively controlled to suit the requirements of the vessel being loaded, and that it may be immediately discontinued notwithstanding the fact that the material in a car vmay be in the process of fiowing from the car into the hopper. i

The results enumerated are advantageous, a a vessel may thus be loaded in a minimum period of time and a car may be dumped and run off the cradle in a minimum period of time. In addition, the relative arrangement of parts makes a flexible control, whereby the various movements may be readily performed during the loading operation and in an expeditious manner.

I claim:

1. In a car dumper having a frame, the combination of a hopper arranged to receive the contents of a car, said hopper extending downwardly and having the lower end thereof formed to provide a lateral discharge opening, a U-shaped gate member pivotally mounted above the opening, and means including a crank pitman for -moving the member about said pivot to control the flow of material from the hopper.

2. Ina car dumper, the combination of a hopper disposed therebeneath, the bottom of the hopper terminating in a lateral discharge opening, a gate associated with the opening andbeing adapted to be moved along the bottom of the hopper to form an extension of the bottom beyond the opening, said gate functioning to control the iloW o material from the hopper, and mechanism for selectively moving the gate withreference to the hopper.`

3. In a car dumper having a hopper, a conveyer boom beneath the hopper, and means for guiding the contents of the hopper onto the oonveyor, the combination of a support for said boom comprising a shaft, two pivoted arms, one on either sidel of the boom, attached to the shaft, rotating members mounted on said shaft bearing on the upper surface of the boom, and rotating members mounted on said pivoted arms and bearing on the under surface of the boom, thereby permitting a tilting and longitudinally shifting motion of the boom with reference to the guiding means.

e. In a car dumper, having a hopper, and a conveyor disposed beneath the hopper, the combination of a threaded member associated with the conveyor and mechanism for rotating the member whereby the conveyor may be shifted longitudinally with reference to the hopper, and a support for the conveyor pivotally carried by the hopper comprising a plurality of surfaces lying in spaced relationship in a plane parallel to the axis of the threaded member.

5. In a car dumper, having a hopper, the combination of a conveyor pivotally supported beneath said hopper, a threaded member mounted on the conveyor, a coacting threaded member associated with the support, and mechanism for rotating the rst member whereby the conveyor may be shifted longitudinally of itself with reference to said hopper, said threaded members' providing -a lock against longitudinal movement of i the conveyor when said mechanism. is idle.

6. In a car dumper, having a hopper, the combination of a conveyor beneath the hopper'l pivotally supported intermediate its ends but nearer its inner end, a threaded portion in they pivotal support, a threaded member for shifting the conveyor longitudinally with reference to the hopper, said member being rotatably mounted on the conveyor adjacent its inner end and coacting with the threaded portion in the support, whereby the g, i

threaded member is placed in tension.

'7. In a car dumper, having a support for a car, a conveyor beneath the support, and means for guiding the contents of a car onto the conveyor, the combination of means pivoted about a horizontally extending axis for supporting the conveyor so as to permit a tilting and longitudinal shifting motion thereof, and longitudinal shifting means pivoted about the same axis as the supporting means and maintaining a constant parallel relationship therewith.

8. In a car dumper, the combination of a hopper, a conveyor disposed beneath the hopper, a threaded member associated with the conveyor for shifting the conveyor longitudinally with reference to said hopper, two arms pivotally supported from the hopper and straddling the conveyor, a plurality of 'conveyor supports at the extremities of the arms and lying in a common plane, and a threaded portion through the arms adjacent the point of pivotal support and lying in a plane parallel to the conveyor supports for coacting with the threaded member.

9. In a car dumper, the combination of a hopber, a conveyor boom disposed beneath the hopi per, a pivot carried by the hopper for mounting the boom so as to' permit tilting and longitudinally shifting motion thereof, and guiding and supporting members for the .boom contacting the upper and lower surfaces thereof and supported l by the pivot.

1D. In a car'dumper, the combination of a hopper, a conveyor disposed beneath the hopper, pivoted arms carried by the hopper, and a threaded member attached to the pivoted arms and to one end of the conveyor, the vertical component of gravitationalforces acting upon the conveyor being resisted by the pivoted arms, and the component of said forces acting along the plane of the conveyor `being resisted by the threaded member held in tension between the pivoted arms and the end of the conveyor adjacent thereto.

11. In a car dumper, having a frame, the combination of a hopper arranged to receive the contents of a car, said hopper extending downwardly and having a bottom formed to provide a lateral discharge opening and adapted to support the direct weight of all material in the hopper, a U-shaped gate member pivotally mounted above the opening, and means for moving the member about said pivot to act as an extension of the hopper bottom to support any desired portion of the weight of the material tending to Ilow through the opening.

12. In a car dumper, the combination of a hopper, the bottom of the hopper terminating in a lateral discharge opening, a gate associated with the opening, said gate being adapted to be moved along and outside the bottom of the hopper to form a lateral continuation of the bottom beyond said opening and said gate being of suicient extent to support the material tending to flow through the opening when the material is at its angle of repose, and mechanism for selectively moving the gate with reference to the hopper.

13. In a car dumper, the combination of a hopper, the bottom of the hopper terminating in a lateral discharge opening, a closure member for the opening, a conveyor extending laterally from Y the hopper, and a common pivotal support for the conveyor and the closure member.

14. In a car dumper, having means for support- `ing a car, the combination of a boom pivotally mounted beneath said means, rotating members at either end of the boom and supported thereby, a conveyor within the boom mounted on the rotating members, a closed discharge conduit adjacent one Vend of the conveyor, and connecting means between said conduit and conveyor boom comprising a deflecting member and a sleeve member pivotally supported about the rotating member at the end of the conveyor and telescopically fitted to each other, said deflecting member also Iitting telescopically with the boom and said sleeve member fitting telescopically with the discharge conduit.

15. In a car dumper, the combination with a frame, .a hopper associated with the frame, said hopper being adapted to hold more than the contents of one car, a boom comprising a boxlike member having the lower end thereof disposed about the bottom of the hopper, a conveyor within the boom, said conveyor passing close to the hopper and including a rotary member adjacent the discharge end thereof, means for varying the flow of material from the hopper to the conveyor while maintaining the close spacing between the conveyor and hopper, means adjacent the lower end of the boom for shifting it longitudinally with reference to the frame, a tubular discharge conduit gf mounted on two pivots for universal movement on the boom adjacent the discharge end of the conveyor, the axis of one of the pivots being coextensive with the axis of said rotary member, means for maintaining a closed connection between the boom and conduit, and mechanism carried by the boom for varying the elevation and direction of the discharge end of the conduit with reference to the boom.

16. In a car dumper, the combination with a 105 hopper having a single centrally located discharge opening adjacent the bottom thereof, a conveyor extending laterally from beneath the hopper opening and carried thereby for longitudinal and pivotal adjustment, the pivotal u@ mounting of the conveyor being above the conveyor so that the distance between the pivot and conveyor is constant in all positions of adjustment, and means for adjusting said conveyor.

ROBERT W. KALTENBACI-I. Y 

